Technical Notes:
1.Chiral Brønsted acid catalysis for enantioselective Hosomi-Sakurai re action of imines with allyltrimethylsilane
2.Chiral Brønsted acid catalysis for ste reoselective Mannich-type reactions of in situ generated C-alkynyl imines with ß-keto esters .
3.Chiral Brønsted acid catalysis for Mannich-type re action of N-Boc- iminium intermediates, generated in situ from N-Boc- aminals.